learned in class. 9.Ask the students to do more practice after class and get ready for presentation during the next session. 10.Summary of the English Vowels Diphthongs: Centring Diphthongs:/ia//ea//ua/ Closing Diphthongs:/au//ou/,ending in /u/ Closing Diphthongs:lei//,ending in/ 11.After-class assignments:Review and memorize the words,phrases,sentences in class.Make sentences containing Vowels Diphthongs /ei//ai//i//au//ou//ia/ leal Notes for Teachers Vowels:Diphthongs In this unit,we will learn the diphthongs in English. There are eight diphthongs in English.I iphthongs are sounds which consist of a movement of glide from one vowel to another.Perhaps the most important thing to remember about all the diphthongs is that the first part is much longer and stronger than the second part.Take /ai/as an example.Most of this diphthong consists of the [a] vowel and only in about the last quarter of the diphthong does the glide to lil begin As the glide to [i]happens the loudness of the ound de As a result,the [i] part is shorter and quieter. The English diphthongs can be shown in the following diagram(P69): Diphthong centring nding in a ending in i The following is a description of the eight English diphthongs(70) /ia ea ual /ia ea ua/are called centring diphthongs because they all glide towards the [ (schwa)vowel,as the symbols indicate.The starting point for/i/is alittle closer than 间in bit,bin /eal begins with the similar vowel sound as the [e]of get.men./u/haslearned in class. 9. Ask the students to do more practice after class and get ready for presentation during the next session. 10. Summary of the English Vowels Diphthongs: ⚫ Centring Diphthongs: /iә/ /eә/ /uә/ ⚫ Closing Diphthongs: /au/ /әu/, ending in /u/ ⚫ Closing Diphthongs: /ei/ /ai/ /ɔi/, ending in /i/ 11. After-class assignments: Review and memorize the words, phrases, sentences in class. Make sentences containing Vowels Diphthongs /ei/ /ai/ /ɔi/ /au/ /әu/ /iә/ /eә/. Notes for Teachers Vowels: Diphthongs In this unit, we will learn the diphthongs in English. There are eight diphthongs in English. Diphthongs are sounds which consist of a movement of glide from one vowel to another. Perhaps the most important thing to remember about all the diphthongs is that the first part is much longer and stronger than the second part. Take /ai/ as an example. Most of this diphthong consists of the [a] vowel, and only in about the last quarter of the diphthong does the glide to [i] begin. As the glide to [i] happens, the loudness of the sound decreases. As a result, the [i] part is shorter and quieter. The English diphthongs can be shown in the following diagram (P69): Diphthong centring closing ending in ә ending in i ending in u iә eә uә e i ai ɔ i әu au The following is a description of the eight English diphthongs (70). / iә eә uә/ / iә eә uә/ are called centring diphthongs because they all glide towards the [ә] (schwa) vowel, as the symbols indicate. The starting point for /iә/ is a little closer than [i] in bit, bin. /eә/ begins with the similar vowel sound as the [e] of get, men. /uә/ has